Concrete-mold.



W. D. HORNING.

CONCRETE MOLD. APPLICATION man 0c.9.191a.

Patented Dec. 7, 1915.

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Application filed December 9, 1913.

To all whom it may concern:

Be it known that I, WALTER D. Honnmo, a citizen of the United States, and resident of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented cer tain new and useful Improvements in Concrete-Molds; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention refers to molds for forming concrete tubes or pipe sections such, for example, as sewer pipes or tile, the same having interlocking joints.

The object of my invention is to provide a simple, economical and effective means for finishing the upper edges of the concrete pipe sections and for trapping the overflow material from the mouth of the mold;

With the above and other minor objects in view the invention consists in certain peculiarities of construction and combination of parts as hereinafter set forth with reference to the accompanying drawings and subsequently claimed.

In the drawings Figure 1 represents a side elevation of a mold embodying the features of my invention with parts broken away and in section to more clearly illustrate certain details of construction; Fig. 2, a detailed elevation of the mouth end of the mold illustrating a troweling or finishing mechanism, the mouth of the mold. being broken away to more clearly show structural features, and Fig. 3, a fragmentary plan view of said mold.

teferring by characters to the drawings, 1 represents a. hollow non-rotatory core. The core is supported upon a plunger rod 1 through spider arm connections 1. The core is arranged to be inserted and with drawn from a mold shell 2 and the said shell is provided with a belied mouth-cap 3 at its upper end and a reinforced angle-iron band 3 as its lower end. The core is of lesser diameter than the shell, whereby a flowspace is obtained into which the concrete A is poured. Supported about the mouth-cap is an overflow pan 4 having an inturned edge 4t which is adapted to rest upon the upper lipped edge of said moutlrcap, the said overflow pan being arranged to receive surplu material as it is discharged from the mouth of the mold.

In molding a tubular tile section the material is poured to a point approximately upon a level with the mouth-cap edge and there,

Specification of Letters Patent.

Patented Dec. v, rain.

Serial No. 805,573.

after a reaming'collar 5 is dropped into place over the'upper end of the core, being in telescopic connection therewith. The reaming collar is adapted to enter the material and form the female bell-shaped end of the pipe section, as best shown in Fig. 1. Thus it is apparent that when the reaming collar is inserted in the position shown the depth to which it enters the material is gaged by a stop-ear 6, which stop-ear projects from the upper face ofthe collar and is adapted to rest upon the upper edge of the core. The said reaming collar is held against rotation by engagement of the stopear 6 with a finger 6, which finger overlaps the ear and extends from the adjacent edge of the core. The collar is also provided with suspension pins 7, whereby it may be raised or lowered. The material which is displaced by the reaming collar when it is inserted in position will be caused to overflow the mouth-cap and will be trapped or collected in the overflow pan 4:.

In order to finish the upper edge of the pipe section, I provide a trowel 8, which trowel is in the form of a leaf spring that is secured to a lug 8' projecting from the face of the reaming collar. The free finishing end of the trowel is engaged by a set-screw 9, which set-screw is in threaded union with an ear that also projects from the face of the collar. Hence it is apparent that the finished edge of the pipe section can be, to a degree, regulated as to height relative to the After the trowel 1 mouth of the mold-cap. has been set to the desired elevation by the set-screw, the mold-shell, together with the overflow pan, is revolved in the direction indicated by the arrow in Figs. 1, 2 and 3. The mold shell 2, for example, may be rotated by a driven belt, which belt may encircle the mold shell, whereby the latter is utilized as a pulley, or various other mechanisms not shown may be employed for obtaining the desired rotary motion. This rotation of the mold pipe section will thus smooth off the upper edge of the pipe section due to its contact with the troweling mecha nism. Owing to the fact that the inner surface of the mold shell 2 is rough or unpolished, the raw concrete A will adhere thereto, while the said shell is revolved and, owing to the factthat the outer surface of the non-rotary core 1 is polished, there is no liability of the adjacent surface of the c011- crete tube to adhere thereto. Thus the tile I may, without departing from the spirit of myinvention, employ a series of brackets for supporting said pan, under which condition the saidbrackets would obviously be attached to the bell-shaped mouth-cap in a any suitable manner.

I claim: V

1.. The combination of a mold for forming tubular pipe sections havingan outer rotatoryshell and a non-rotatory core fitted therein, a separable reaming collar in telescopic unionwith the upper end of the core,

means for locking, said collar and core together, and a trowel member carried by the collar adapted to finish the upper end of the molded pipe-section.

2. The combination of a mold for forming tubularpipe sections having an outer lar adapted to finish the upper end of the 'molded pipe section, and means for adjusting the trowel member.

3. The combination of a mold for forming tubular pipe sections having an outer shell member, and a core member fitted therein, means for imparting rotary motion to one of said members, a separable reaming collar in telescopic union with the upper end of the core member, means for locking the collar and core together, a troweling member carried by the collar adapted to finish the upper end of the molded pipe section, and an overflow pan extending from the upper end of the shell in juxtaposition to the troweling member.

In testimony that I claim the foregoing I have hereunto set my hand, at Milwaukee, in the county of Milwaukee and State of Wisconsin, in the presence of two witnesses.

WALTER D. HORNING. lVitnesses GEO. W. YOUNG, M. E. DOWNEY.

7 Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

